2 *------------------------------------------------------------------
3 * Copyright (c) 2017 Cisco and/or its affiliates.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 *------------------------------------------------------------------
21 #include <sys/types.h>
23 #include <sys/ioctl.h>
24 #include <sys/socket.h>
28 #include <sys/prctl.h>
34 #include <linux/icmp.h>
35 #include <arpa/inet.h>
37 #include <netinet/if_ether.h>
38 #include <net/if_arp.h>
39 #include <asm/byteorder.h>
44 #include <sys/eventfd.h>
45 #include <sys/timerfd.h>
46 #include <sys/epoll.h>
48 #include <linux/memfd.h>
50 /* memif protocol msg, ring and descriptor definitions */
54 /* socket messaging functions */
56 /* private structs and functions */
57 #include <memif_private.h>
59 #define ERRLIST_LEN 40
60 #define MAX_ERRBUF_LEN 256
63 #define MEMIF_MEMORY_BARRIER() __builtin_ia32_sfence ()
65 #define MEMIF_MEMORY_BARRIER() __sync_synchronize ()
66 #endif /* __x86_x64__ */
68 libmemif_main_t libmemif_main;
70 int poll_cancel_fd = -1;
72 static char memif_buf[MAX_ERRBUF_LEN];
74 const char *memif_errlist[ERRLIST_LEN] = { /* MEMIF_ERR_SUCCESS */
76 /* MEMIF_ERR_SYSCALL */
77 "Unspecified syscall error (build with -DMEMIF_DBG or make debug).",
78 /* MEMIF_ERR_CONNREFUSED */
81 "Permission to resoure denied.",
82 /* MEMIF_ERR_NO_FILE */
83 "Socket file does not exist",
84 /* MEMIF_ERR_FILE_LIMIT */
85 "System limit on total numer of open files reached.",
86 /* MEMIF_ERR_PROC_FILE_LIMIT */
87 "Per-process limit on total number of open files reached.",
88 /* MEMIF_ERR_ALREADY */
89 "Connection already requested.",
91 "File descriptor refers to file other than socket, or operation would block.",
92 /* MEMIF_ERR_BAD_FD */
93 "Bad file descriptor.",
96 /* MEMIF_ERR_INVAL_ARG */
98 /* MEMIF_ERR_NOCONN */
99 "Memif connection handle does not point to existing conenction",
101 "Memif connection handle points to existing connection",
102 /* MEMIF_ERR_CB_FDUPDATE */
103 "Callback memif_control_fd_update_t returned error",
104 /* MEMIF_ERR_FILE_NOT_SOCK */
105 "File specified by socket filename exists and is not socket.",
106 /* MEMIF_ERR_NO_SHMFD */
107 "Missing shared memory file descriptor. (internal error)",
108 /* MEMIF_ERR_COOKIE */
109 "Invalid cookie on ring. (internal error)",
110 /* MEMIF_ERR_NOBUF_RING */
112 /* MEMIF_ERR_NOBUF */
113 "Not enough memif buffers. There are unreceived data in shared memory.",
114 /* MEMIF_ERR_NOBUF_DET */
115 "Not enough space for memif details in suplied buffer. String data might be malformed.",
116 /* MEMIF_ERR_INT_WRITE */
117 "Send interrupt error.",
118 /* MEMIF_ERR_MFMSG */
119 "Malformed message received on control channel.",
122 /* MEMIF_ERR_PROTO */
123 "Incompatible memory interface protocol version.",
125 "Unmatched interface id.",
126 /* MEMIF_ERR_ACCSLAVE */
127 "Slave cannot accept connection reqest.",
128 /* MEMIF_ERR_ALRCONN */
129 "Interface is already connected.",
132 /* MEMIF_ERR_SECRET */
134 /* MEMIF_ERR_NOSECRET */
136 /* MEMIF_ERR_MAXREG */
137 "Limit on total number of regions reached.",
138 /* MEMIF_ERR_MAXRING */
139 "Limit on total number of ring reached.",
140 /* MEMIF_ERR_NO_INTFD */
141 "Missing interrupt file descriptor. (internal error)",
142 /* MEMIF_ERR_DISCONNECT */
143 "Interface received disconnect request.",
144 /* MEMIF_ERR_DISCONNECTED */
145 "Interface is disconnected.",
146 /* MEMIF_ERR_UNKNOWN_MSG */
147 "Unknown message type received on control channel. (internal error)",
148 /* MEMIF_ERR_POLL_CANCEL */
149 "Memif event polling was canceled.",
150 /* MEMIF_ERR_MAX_RING */
151 "Maximum log2 ring size is 15",
152 /* MEMIF_ERR_PRIVHDR */
153 "Private headers not supported."
156 #define MEMIF_ERR_UNDEFINED "undefined error"
159 memif_strerror (int err_code)
161 if (err_code >= ERRLIST_LEN)
163 strncpy (memif_buf, MEMIF_ERR_UNDEFINED, strlen (MEMIF_ERR_UNDEFINED));
164 memif_buf[strlen (MEMIF_ERR_UNDEFINED)] = '\0';
168 strncpy (memif_buf, memif_errlist[err_code],
169 strlen (memif_errlist[err_code]));
170 memif_buf[strlen (memif_errlist[err_code])] = '\0';
178 return MEMIF_VERSION;
181 #define DBG_TX_BUF (0)
182 #define DBG_RX_BUF (1)
186 print_bytes (void *data, uint16_t len, uint8_t q)
189 printf ("\nTX:\n\t");
191 printf ("\nRX:\n\t");
193 for (i = 0; i < len; i++)
196 printf ("\n%d:\t", i);
197 printf ("%02X ", ((uint8_t *) (data))[i]);
201 #endif /* MEMIF_DBG_SHM */
204 memif_syscall_error_handler (int err_code)
206 DBG ("%s", strerror (err_code));
209 return MEMIF_ERR_SUCCESS;
210 if (err_code == EACCES)
211 return MEMIF_ERR_ACCES;
212 if (err_code == ENFILE)
213 return MEMIF_ERR_FILE_LIMIT;
214 if (err_code == EMFILE)
215 return MEMIF_ERR_PROC_FILE_LIMIT;
216 if (err_code == ENOMEM)
217 return MEMIF_ERR_NOMEM;
218 /* connection refused if master does not exist
219 this error would spam the user until master was created */
221 if (err_code == ECONNREFUSED)
222 return MEMIF_ERR_SUCCESS;
224 if (err_code == ECONNREFUSED)
225 return MEMIF_ERR_CONNREFUSED;
226 if (err_code == EALREADY)
227 return MEMIF_ERR_ALREADY;
228 if (err_code == EAGAIN)
229 return MEMIF_ERR_AGAIN;
230 if (err_code == EBADF)
231 return MEMIF_ERR_BAD_FD;
232 if (err_code == ENOENT)
233 return MEMIF_ERR_NO_FILE;
235 /* other syscall errors */
236 return MEMIF_ERR_SYSCALL;
240 memif_add_epoll_fd (int fd, uint32_t events)
244 DBG ("invalid fd %d", fd);
247 struct epoll_event evt;
248 memset (&evt, 0, sizeof (evt));
251 if (epoll_ctl (memif_epfd, EPOLL_CTL_ADD, fd, &evt) < 0)
253 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
256 DBG ("fd %d added to epoll", fd);
261 memif_mod_epoll_fd (int fd, uint32_t events)
265 DBG ("invalid fd %d", fd);
268 struct epoll_event evt;
269 memset (&evt, 0, sizeof (evt));
272 if (epoll_ctl (memif_epfd, EPOLL_CTL_MOD, fd, &evt) < 0)
274 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
277 DBG ("fd %d moddified on epoll", fd);
282 memif_del_epoll_fd (int fd)
286 DBG ("invalid fd %d", fd);
289 struct epoll_event evt;
290 memset (&evt, 0, sizeof (evt));
291 if (epoll_ctl (memif_epfd, EPOLL_CTL_DEL, fd, &evt) < 0)
293 DBG ("epoll_ctl: %s fd %d", strerror (errno), fd);
296 DBG ("fd %d removed from epoll", fd);
301 memif_control_fd_update (int fd, uint8_t events)
303 if (events & MEMIF_FD_EVENT_DEL)
304 return memif_del_epoll_fd (fd);
307 if (events & MEMIF_FD_EVENT_READ)
309 if (events & MEMIF_FD_EVENT_WRITE)
312 if (events & MEMIF_FD_EVENT_MOD)
313 return memif_mod_epoll_fd (fd, evt);
315 return memif_add_epoll_fd (fd, evt);
319 add_list_elt (memif_list_elt_t * e, memif_list_elt_t ** list, uint16_t * len)
321 libmemif_main_t *lm = &libmemif_main;
324 for (i = 0; i < *len; i++)
326 if ((*list)[i].data_struct == NULL)
328 (*list)[i].key = e->key;
329 (*list)[i].data_struct = e->data_struct;
333 memif_list_elt_t *tmp;
334 tmp = lm->realloc (*list, sizeof (memif_list_elt_t) * *len * 2);
338 for (i = *len; i < *len * 2; i++)
341 tmp[i].data_struct = NULL;
344 tmp[*len].key = e->key;
345 tmp[*len].data_struct = e->data_struct;
354 get_list_elt (memif_list_elt_t ** e, memif_list_elt_t * list, uint16_t len,
363 for (i = 0; i < len; i++)
365 if (list[i].key == key)
375 /* does not free memory, only marks element as free */
377 free_list_elt (memif_list_elt_t * list, uint16_t len, int key)
380 for (i = 0; i < len; i++)
382 if (list[i].key == key)
385 list[i].data_struct = NULL;
394 free_list_elt_ctx (memif_list_elt_t * list, uint16_t len,
395 memif_connection_t * ctx)
398 for (i = 0; i < len; i++)
400 if (list[i].key == -1)
402 if (list[i].data_struct == ctx)
404 list[i].data_struct = NULL;
414 memif_control_fd_update_register (memif_control_fd_update_t * cb)
416 libmemif_main_t *lm = &libmemif_main;
417 lm->control_fd_update = cb;
421 memif_register_external_region (memif_add_external_region_t * ar,
422 memif_get_external_region_addr_t * gr,
423 memif_del_external_region_t * dr,
424 memif_get_external_buffer_offset_t * go)
426 libmemif_main_t *lm = &libmemif_main;
427 lm->add_external_region = ar;
428 lm->get_external_region_addr = gr;
429 lm->del_external_region = dr;
430 lm->get_external_buffer_offset = go;
434 memif_alloc_register (memif_alloc_t * ma)
436 libmemif_main_t *lm = &libmemif_main;
441 memif_realloc_register (memif_realloc_t * mr)
443 libmemif_main_t *lm = &libmemif_main;
448 memif_free_register (memif_free_t * mf)
450 libmemif_main_t *lm = &libmemif_main;
455 memif_set_connection_request_timer(struct itimerspec timer)
457 libmemif_main_t *lm = &libmemif_main;
458 int err = MEMIF_ERR_SUCCESS;
462 /* overwrite timer, if already armed */
463 if (lm->disconn_slaves != 0)
465 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
467 err = memif_syscall_error_handler (errno);
474 memif_init (memif_control_fd_update_t * on_control_fd_update, char *app_name,
475 memif_alloc_t * memif_alloc, memif_realloc_t * memif_realloc,
476 memif_free_t * memif_free)
478 int err = MEMIF_ERR_SUCCESS; /* 0 */
479 libmemif_main_t *lm = &libmemif_main;
480 memset (lm, 0, sizeof (libmemif_main_t));
482 if (memif_alloc != NULL)
484 memif_alloc_register (memif_alloc);
487 memif_alloc_register (malloc);
489 if (memif_realloc != NULL)
491 memif_realloc_register (memif_realloc);
494 memif_realloc_register (realloc);
496 if (memif_free != NULL)
497 memif_free_register (memif_free);
499 memif_free_register (free);
501 if (app_name != NULL)
503 uint8_t len = (strlen (app_name) > MEMIF_NAME_LEN)
504 ? strlen (app_name) : MEMIF_NAME_LEN;
505 strncpy ((char *) lm->app_name, app_name, len);
509 strncpy ((char *) lm->app_name, MEMIF_DEFAULT_APP_NAME,
510 strlen (MEMIF_DEFAULT_APP_NAME));
513 /* register control fd update callback */
514 if (on_control_fd_update != NULL)
515 memif_control_fd_update_register (on_control_fd_update);
518 memif_epfd = epoll_create (1);
519 memif_control_fd_update_register (memif_control_fd_update);
520 if ((poll_cancel_fd = eventfd (0, EFD_NONBLOCK)) < 0)
523 DBG ("eventfd: %s", strerror (err));
524 return memif_syscall_error_handler (err);
526 lm->control_fd_update (poll_cancel_fd, MEMIF_FD_EVENT_READ);
527 DBG ("libmemif event polling initialized");
530 lm->control_list_len = 2;
531 lm->interrupt_list_len = 2;
532 lm->listener_list_len = 1;
533 lm->pending_list_len = 1;
536 lm->alloc (sizeof (memif_list_elt_t) * lm->control_list_len);
537 if (lm->control_list == NULL)
539 err = MEMIF_ERR_NOMEM;
543 lm->alloc (sizeof (memif_list_elt_t) * lm->interrupt_list_len);
544 if (lm->interrupt_list == NULL)
546 err = MEMIF_ERR_NOMEM;
550 lm->alloc (sizeof (memif_list_elt_t) * lm->listener_list_len);
551 if (lm->listener_list == NULL)
553 err = MEMIF_ERR_NOMEM;
557 lm->alloc (sizeof (memif_list_elt_t) * lm->pending_list_len);
558 if (lm->pending_list == NULL)
560 err = MEMIF_ERR_NOMEM;
565 for (i = 0; i < lm->control_list_len; i++)
567 lm->control_list[i].key = -1;
568 lm->control_list[i].data_struct = NULL;
570 for (i = 0; i < lm->interrupt_list_len; i++)
572 lm->interrupt_list[i].key = -1;
573 lm->interrupt_list[i].data_struct = NULL;
575 for (i = 0; i < lm->listener_list_len; i++)
577 lm->listener_list[i].key = -1;
578 lm->listener_list[i].data_struct = NULL;
580 for (i = 0; i < lm->pending_list_len; i++)
582 lm->pending_list[i].key = -1;
583 lm->pending_list[i].data_struct = NULL;
586 lm->disconn_slaves = 0;
588 lm->timerfd = timerfd_create (CLOCK_REALTIME, TFD_NONBLOCK);
591 err = memif_syscall_error_handler (errno);
595 lm->arm.it_value.tv_sec = MEMIF_DEFAULT_RECONNECT_PERIOD_SEC;
596 lm->arm.it_value.tv_nsec = MEMIF_DEFAULT_RECONNECT_PERIOD_NSEC;
597 lm->arm.it_interval.tv_sec = MEMIF_DEFAULT_RECONNECT_PERIOD_SEC;
598 lm->arm.it_interval.tv_nsec = MEMIF_DEFAULT_RECONNECT_PERIOD_NSEC;
600 if (lm->control_fd_update (lm->timerfd, MEMIF_FD_EVENT_READ) < 0)
602 DBG ("callback type memif_control_fd_update_t error!");
603 err = MEMIF_ERR_CB_FDUPDATE;
614 static inline memif_ring_t *
615 memif_get_ring (memif_connection_t * conn, memif_ring_type_t type,
618 if (&conn->regions[0] == NULL)
620 void *p = conn->regions[0].addr;
622 sizeof (memif_ring_t) +
623 sizeof (memif_desc_t) * (1 << conn->run_args.log2_ring_size);
624 p += (ring_num + type * conn->run_args.num_s2m_rings) * ring_size;
626 return (memif_ring_t *) p;
630 memif_set_rx_mode (memif_conn_handle_t c, memif_rx_mode_t rx_mode,
633 memif_connection_t *conn = (memif_connection_t *) c;
635 return MEMIF_ERR_NOCONN;
637 (conn->args.is_master) ? conn->run_args.num_s2m_rings : conn->
638 run_args.num_m2s_rings;
640 return MEMIF_ERR_QID;
642 conn->rx_queues[qid].ring->flags = rx_mode;
643 DBG ("rx_mode flag: %u", conn->rx_queues[qid].ring->flags);
644 return MEMIF_ERR_SUCCESS;
648 memif_create (memif_conn_handle_t * c, memif_conn_args_t * args,
649 memif_connection_update_t * on_connect,
650 memif_connection_update_t * on_disconnect,
651 memif_interrupt_t * on_interrupt, void *private_ctx)
653 libmemif_main_t *lm = &libmemif_main;
654 int err, i, index = 0, sockfd = -1;
655 memif_list_elt_t list_elt;
656 memif_connection_t *conn = (memif_connection_t *) * c;
659 DBG ("This handle already points to existing memif.");
660 return MEMIF_ERR_CONN;
662 conn = (memif_connection_t *) lm->alloc (sizeof (memif_connection_t));
665 err = MEMIF_ERR_NOMEM;
668 memset (conn, 0, sizeof (memif_connection_t));
670 conn->args.interface_id = args->interface_id;
672 if (args->log2_ring_size == 0)
673 args->log2_ring_size = MEMIF_DEFAULT_LOG2_RING_SIZE;
674 else if (args->log2_ring_size > MEMIF_MAX_LOG2_RING_SIZE)
676 err = MEMIF_ERR_MAX_RING;
679 if (args->buffer_size == 0)
680 args->buffer_size = MEMIF_DEFAULT_BUFFER_SIZE;
681 if (args->num_s2m_rings == 0)
682 args->num_s2m_rings = MEMIF_DEFAULT_TX_QUEUES;
683 if (args->num_m2s_rings == 0)
684 args->num_m2s_rings = MEMIF_DEFAULT_RX_QUEUES;
686 conn->args.num_s2m_rings = args->num_s2m_rings;
687 conn->args.num_m2s_rings = args->num_m2s_rings;
688 conn->args.buffer_size = args->buffer_size;
689 conn->args.log2_ring_size = args->log2_ring_size;
690 conn->args.is_master = args->is_master;
691 conn->args.mode = args->mode;
692 conn->msg_queue = NULL;
693 conn->regions = NULL;
694 conn->tx_queues = NULL;
695 conn->rx_queues = NULL;
697 conn->on_connect = on_connect;
698 conn->on_disconnect = on_disconnect;
699 conn->on_interrupt = on_interrupt;
700 conn->private_ctx = private_ctx;
701 memset (&conn->run_args, 0, sizeof (memif_conn_run_args_t));
703 uint8_t l = strlen ((char *) args->interface_name);
704 strncpy ((char *) conn->args.interface_name, (char *) args->interface_name,
707 /* allocate and initialize socket_filename so it can be copyed to sun_path
708 without memory leaks */
709 conn->args.socket_filename = lm->alloc (sizeof (char *) * 108);
710 if (conn->args.socket_filename == NULL)
712 err = MEMIF_ERR_NOMEM;
715 memset (conn->args.socket_filename, 0, 108 * sizeof (char *));
717 if (args->socket_filename)
719 if (conn->args.socket_filename == NULL)
721 err = memif_syscall_error_handler (errno);
724 strncpy ((char *) conn->args.socket_filename,
725 (char *) args->socket_filename,
726 strlen ((char *) args->socket_filename));
730 uint16_t sdl = strlen (MEMIF_DEFAULT_SOCKET_DIR);
731 uint16_t sfl = strlen (MEMIF_DEFAULT_SOCKET_FILENAME);
732 if (conn->args.socket_filename == NULL)
734 err = memif_syscall_error_handler (errno);
737 strncpy ((char *) conn->args.socket_filename,
738 MEMIF_DEFAULT_SOCKET_DIR, sdl);
739 conn->args.socket_filename[sdl] = '/';
740 strncpy ((char *) (conn->args.socket_filename + 1 + sdl),
741 MEMIF_DEFAULT_SOCKET_FILENAME, sfl);
744 if ((l = strlen ((char *) args->secret)) > 0)
746 strncpy ((char *) conn->args.secret, (char *) args->secret, l);
749 if (conn->args.is_master)
751 conn->run_args.buffer_size = conn->args.buffer_size;
753 memif_list_elt_t elt;
754 for (i = 0; i < lm->listener_list_len; i++)
757 (memif_socket_t *) lm->listener_list[i].data_struct) != NULL)
760 ((char *) ms->filename, (char *) conn->args.socket_filename,
761 strlen ((char *) ms->filename)) == 0)
763 /* add interface to listener socket */
764 elt.key = conn->args.interface_id;
765 *c = elt.data_struct = conn;
766 add_list_elt (&elt, &ms->interface_list,
767 &ms->interface_list_len);
769 conn->listener_fd = ms->fd;
775 struct stat file_stat;
776 if (stat ((char *) conn->args.socket_filename, &file_stat) == 0)
778 if (S_ISSOCK (file_stat.st_mode))
779 unlink ((char *) conn->args.socket_filename);
781 return memif_syscall_error_handler (errno);
783 DBG ("creating socket file");
784 ms = lm->alloc (sizeof (memif_socket_t));
787 err = MEMIF_ERR_NOMEM;
791 lm->alloc (strlen ((char *) conn->args.socket_filename) +
793 if (ms->filename == NULL)
795 err = MEMIF_ERR_NOMEM;
798 memset (ms->filename, 0,
799 strlen ((char *) conn->args.socket_filename) +
801 strncpy ((char *) ms->filename,
802 (char *) conn->args.socket_filename,
803 strlen ((char *) conn->args.socket_filename));
804 ms->interface_list_len = 1;
806 lm->alloc (sizeof (memif_list_elt_t) *
807 ms->interface_list_len);
808 if (ms->interface_list == NULL)
810 err = MEMIF_ERR_NOMEM;
813 ms->interface_list[0].key = -1;
814 ms->interface_list[0].data_struct = NULL;
815 struct sockaddr_un un = { 0 };
818 ms->fd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
821 err = memif_syscall_error_handler (errno);
824 DBG ("socket %d created", ms->fd);
825 un.sun_family = AF_UNIX;
826 strncpy ((char *) un.sun_path, (char *) ms->filename,
827 sizeof (un.sun_path) - 1);
830 (ms->fd, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on)) < 0)
832 err = memif_syscall_error_handler (errno);
836 if (bind (ms->fd, (struct sockaddr *) &un, sizeof (un)) < 0)
838 err = memif_syscall_error_handler (errno);
842 if (listen (ms->fd, 1) < 0)
844 err = memif_syscall_error_handler (errno);
848 if (stat ((char *) ms->filename, &file_stat) < 0)
850 err = memif_syscall_error_handler (errno);
854 /* add interface to listener socket */
855 elt.key = conn->args.interface_id;
856 *c = elt.data_struct = conn;
857 add_list_elt (&elt, &ms->interface_list,
858 &ms->interface_list_len);
860 conn->listener_fd = ms->fd;
862 /* add listener socket to libmemif main */
864 elt.data_struct = ms;
865 add_list_elt (&elt, &lm->listener_list, &lm->listener_list_len);
866 lm->control_fd_update (ms->fd, MEMIF_FD_EVENT_READ);
873 lm->disconn_slaves++;
876 *c = list_elt.data_struct = conn;
878 add_list_elt (&list_elt, &lm->control_list,
879 &lm->control_list_len)) < 0)
881 err = MEMIF_ERR_NOMEM;
887 /* try connectiong to master */
888 err = memif_request_connection(conn);
889 if ((err < 0) && (lm->disconn_slaves == 1))
891 /* connection failed, arm reconnect timer (if not armed) */
892 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
894 err = memif_syscall_error_handler (errno);
906 if (conn->args.socket_filename)
907 lm->free (conn->args.socket_filename);
915 memif_request_connection(memif_conn_handle_t c)
917 libmemif_main_t *lm = &libmemif_main;
918 memif_connection_t *conn = (memif_connection_t *) c;
919 int err = MEMIF_ERR_SUCCESS;
921 struct sockaddr_un sun;
923 if (conn->args.is_master)
924 return MEMIF_ERR_INVAL_ARG;
926 return MEMIF_ERR_ALRCONN;
928 sockfd = socket (AF_UNIX, SOCK_SEQPACKET, 0);
931 err = memif_syscall_error_handler (errno);
935 sun.sun_family = AF_UNIX;
937 strncpy (sun.sun_path, (char *) conn->args.socket_filename,
938 sizeof (sun.sun_path) - 1);
940 if (connect (sockfd, (struct sockaddr *) &sun,
941 sizeof (struct sockaddr_un)) == 0)
944 conn->read_fn = memif_conn_fd_read_ready;
945 conn->write_fn = memif_conn_fd_write_ready;
946 conn->error_fn = memif_conn_fd_error;
948 lm->control_list[conn->index].key = conn->fd;
950 lm->control_fd_update (sockfd,
951 MEMIF_FD_EVENT_READ |
952 MEMIF_FD_EVENT_WRITE);
954 lm->disconn_slaves--;
955 if (lm->disconn_slaves == 0)
957 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
959 err = memif_syscall_error_handler (errno);
966 strcpy ((char *) conn->remote_disconnect_string,
967 memif_strerror (memif_syscall_error_handler
982 memif_control_fd_handler (int fd, uint8_t events)
984 int i, err = MEMIF_ERR_SUCCESS; /* 0 */
986 memif_list_elt_t *e = NULL;
987 memif_connection_t *conn;
988 libmemif_main_t *lm = &libmemif_main;
989 if (fd == lm->timerfd)
993 size = read (fd, &b, sizeof (b));
998 for (i = 0; i < lm->control_list_len; i++)
1000 if ((lm->control_list[i].key < 0)
1001 && (lm->control_list[i].data_struct != NULL))
1003 conn = lm->control_list[i].data_struct;
1004 if (conn->args.is_master)
1006 memif_request_connection(conn);
1012 get_list_elt (&e, lm->interrupt_list, lm->interrupt_list_len, fd);
1015 if (((memif_connection_t *) e->data_struct)->on_interrupt != NULL)
1018 (((memif_connection_t *) e->data_struct)->
1019 args.is_master) ? ((memif_connection_t *) e->
1020 data_struct)->run_args.
1021 num_s2m_rings : ((memif_connection_t *) e->data_struct)->
1022 run_args.num_m2s_rings;
1023 for (i = 0; i < num; i++)
1025 if (((memif_connection_t *) e->data_struct)->
1026 rx_queues[i].int_fd == fd)
1028 ((memif_connection_t *) e->data_struct)->
1029 on_interrupt ((void *) e->data_struct,
1030 ((memif_connection_t *) e->
1031 data_struct)->private_ctx, i);
1032 return MEMIF_ERR_SUCCESS;
1036 return MEMIF_ERR_SUCCESS;
1038 get_list_elt (&e, lm->listener_list, lm->listener_list_len, fd);
1041 err = memif_conn_fd_accept_ready ((memif_socket_t *) e->data_struct);
1045 get_list_elt (&e, lm->pending_list, lm->pending_list_len, fd);
1048 err = memif_read_ready (fd);
1052 get_list_elt (&e, lm->control_list, lm->control_list_len, fd);
1055 if (events & MEMIF_FD_EVENT_READ)
1058 ((memif_connection_t *) e->data_struct)->
1059 read_fn (e->data_struct);
1060 if (err != MEMIF_ERR_SUCCESS)
1063 if (events & MEMIF_FD_EVENT_WRITE)
1066 ((memif_connection_t *) e->data_struct)->
1067 write_fn (e->data_struct);
1068 if (err != MEMIF_ERR_SUCCESS)
1071 if (events & MEMIF_FD_EVENT_ERROR)
1074 ((memif_connection_t *) e->data_struct)->
1075 error_fn (e->data_struct);
1076 if (err != MEMIF_ERR_SUCCESS)
1082 return MEMIF_ERR_SUCCESS; /* 0 */
1089 memif_poll_event (int timeout)
1091 struct epoll_event evt;
1092 int en = 0, err = MEMIF_ERR_SUCCESS; /* 0 */
1093 uint32_t events = 0;
1094 uint64_t counter = 0;
1096 memset (&evt, 0, sizeof (evt));
1097 evt.events = EPOLLIN | EPOLLOUT;
1099 sigemptyset (&sigset);
1100 en = epoll_pwait (memif_epfd, &evt, 1, timeout, &sigset);
1104 DBG ("epoll_pwait: %s", strerror (err));
1105 return memif_syscall_error_handler (err);
1109 if (evt.data.fd == poll_cancel_fd)
1111 r = read (evt.data.fd, &counter, sizeof (counter));
1113 return MEMIF_ERR_DISCONNECTED;
1115 return MEMIF_ERR_POLL_CANCEL;
1117 if (evt.events & EPOLLIN)
1118 events |= MEMIF_FD_EVENT_READ;
1119 if (evt.events & EPOLLOUT)
1120 events |= MEMIF_FD_EVENT_WRITE;
1121 if (evt.events & EPOLLERR)
1122 events |= MEMIF_FD_EVENT_ERROR;
1123 err = memif_control_fd_handler (evt.data.fd, events);
1130 memif_cancel_poll_event ()
1132 uint64_t counter = 1;
1135 if (poll_cancel_fd == -1)
1137 w = write (poll_cancel_fd, &counter, sizeof (counter));
1138 if (w < sizeof (counter))
1139 return MEMIF_ERR_INT_WRITE;
1145 memif_msg_queue_free (libmemif_main_t * lm, memif_msg_queue_elt_t ** e)
1149 memif_msg_queue_free (lm, &(*e)->next);
1155 /* send disconnect msg and close interface */
1157 memif_disconnect_internal (memif_connection_t * c)
1161 DBG ("no connection");
1162 return MEMIF_ERR_NOCONN;
1165 int err = MEMIF_ERR_SUCCESS, i; /* 0 */
1167 libmemif_main_t *lm = &libmemif_main;
1168 memif_list_elt_t *e;
1170 c->on_disconnect ((void *) c, c->private_ctx);
1174 memif_msg_send_disconnect (c->fd, (uint8_t *) "interface deleted", 0);
1175 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_DEL);
1178 get_list_elt (&e, lm->control_list, lm->control_list_len, c->fd);
1181 if (c->args.is_master)
1182 free_list_elt (lm->control_list, lm->control_list_len, c->fd);
1183 e->key = c->fd = -1;
1186 if (c->tx_queues != NULL)
1189 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1190 run_args.num_s2m_rings;
1191 for (i = 0; i < num; i++)
1193 mq = &c->tx_queues[i];
1198 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1203 lm->free (c->tx_queues);
1204 c->tx_queues = NULL;
1207 if (c->rx_queues != NULL)
1210 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1211 run_args.num_m2s_rings;
1212 for (i = 0; i < num; i++)
1214 mq = &c->rx_queues[i];
1219 if (c->on_interrupt != NULL)
1220 lm->control_fd_update (mq->int_fd, MEMIF_FD_EVENT_DEL);
1223 free_list_elt (lm->interrupt_list, lm->interrupt_list_len,
1228 lm->free (c->rx_queues);
1229 c->rx_queues = NULL;
1232 for (i = 0; i < c->regions_num; i++)
1234 if (&c->regions[i] == NULL)
1236 if (c->regions[i].is_external != 0)
1238 lm->del_external_region (c->regions[i].addr,
1239 c->regions[i].region_size,
1240 c->regions[i].fd, c->private_ctx);
1244 if (munmap (c->regions[i].addr, c->regions[i].region_size) < 0)
1245 return memif_syscall_error_handler (errno);
1246 if (c->regions[i].fd > 0)
1247 close (c->regions[i].fd);
1248 c->regions[i].fd = -1;
1251 lm->free (c->regions);
1255 memset (&c->run_args, 0, sizeof (memif_conn_run_args_t));
1257 memif_msg_queue_free (lm, &c->msg_queue);
1259 if (!(c->args.is_master))
1261 if (lm->disconn_slaves == 0)
1263 if (timerfd_settime (lm->timerfd, 0, &lm->arm, NULL) < 0)
1265 err = memif_syscall_error_handler (errno);
1266 DBG ("timerfd_settime: arm");
1269 lm->disconn_slaves++;
1276 memif_delete (memif_conn_handle_t * conn)
1278 memif_connection_t *c = (memif_connection_t *) * conn;
1281 DBG ("no connection");
1282 return MEMIF_ERR_NOCONN;
1284 libmemif_main_t *lm = &libmemif_main;
1285 memif_list_elt_t *e = NULL;
1286 memif_socket_t *ms = NULL;
1288 int err = MEMIF_ERR_SUCCESS;
1292 DBG ("DISCONNECTING");
1293 err = memif_disconnect_internal (c);
1294 if (err == MEMIF_ERR_NOCONN)
1298 free_list_elt_ctx (lm->control_list, lm->control_list_len, c);
1300 if (c->args.is_master)
1302 get_list_elt (&e, lm->listener_list, lm->listener_list_len,
1306 ms = (memif_socket_t *) e->data_struct;
1308 free_list_elt (ms->interface_list, ms->interface_list_len,
1309 c->args.interface_id);
1310 if (ms->use_count <= 0)
1312 lm->control_fd_update (c->listener_fd, MEMIF_FD_EVENT_DEL);
1313 free_list_elt (lm->listener_list, lm->listener_list_len,
1315 close (c->listener_fd);
1316 c->listener_fd = ms->fd = -1;
1317 lm->free (ms->interface_list);
1318 ms->interface_list = NULL;
1319 lm->free (ms->filename);
1320 ms->filename = NULL;
1328 lm->disconn_slaves--;
1329 if (lm->disconn_slaves <= 0)
1331 if (timerfd_settime (lm->timerfd, 0, &lm->disarm, NULL) < 0)
1333 err = memif_syscall_error_handler (errno);
1334 DBG ("timerfd_settime: disarm");
1339 if (c->args.socket_filename)
1340 lm->free (c->args.socket_filename);
1341 c->args.socket_filename = NULL;
1351 memif_connect1 (memif_connection_t * c)
1353 libmemif_main_t *lm = &libmemif_main;
1358 for (i = 0; i < c->regions_num; i++)
1360 mr = &c->regions[i];
1365 if (mr->is_external)
1367 if (lm->get_external_region_addr == NULL)
1368 return 99; /* FIXME: proper error report */
1370 lm->get_external_region_addr (mr->region_size, mr->fd,
1376 return MEMIF_ERR_NO_SHMFD;
1379 mmap (NULL, mr->region_size, PROT_READ | PROT_WRITE,
1380 MAP_SHARED, mr->fd, 0)) == MAP_FAILED)
1382 return memif_syscall_error_handler (errno);
1389 for (i = 0; i < c->rx_queues_num; i++)
1391 mq = &c->rx_queues[i];
1394 mq->ring = c->regions[mq->region].addr + mq->offset;
1395 if (mq->ring->cookie != MEMIF_COOKIE)
1397 DBG ("wrong cookie on rx ring %u", i);
1398 return MEMIF_ERR_COOKIE;
1400 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1405 for (i = 0; i < c->tx_queues_num; i++)
1407 mq = &c->tx_queues[i];
1410 mq->ring = c->regions[mq->region].addr + mq->offset;
1411 if (mq->ring->cookie != MEMIF_COOKIE)
1413 DBG ("wrong cookie on tx ring %u", i);
1414 return MEMIF_ERR_COOKIE;
1416 mq->ring->head = mq->ring->tail = mq->last_head = mq->alloc_bufs =
1421 lm->control_fd_update (c->fd, MEMIF_FD_EVENT_READ | MEMIF_FD_EVENT_MOD);
1427 memif_add_region (libmemif_main_t * lm, memif_connection_t * conn,
1428 uint8_t has_buffers)
1433 lm->realloc (conn->regions,
1434 sizeof (memif_region_t) * ++conn->regions_num);
1436 return MEMIF_ERR_NOMEM;
1439 r = &conn->regions[conn->regions_num - 1];
1440 memset (r, 0, sizeof (memif_region_t));
1442 if (has_buffers != 0)
1444 r->buffer_offset = 0;
1449 (conn->run_args.num_s2m_rings +
1450 conn->run_args.num_m2s_rings) * (sizeof (memif_ring_t) +
1451 sizeof (memif_desc_t) *
1453 run_args.log2_ring_size));
1456 r->region_size = (has_buffers == 0) ? r->buffer_offset : r->buffer_offset +
1457 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1458 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1460 if ((r->fd = memfd_create ("memif region 0", MFD_ALLOW_SEALING)) == -1)
1461 return memif_syscall_error_handler (errno);
1463 if ((fcntl (r->fd, F_ADD_SEALS, F_SEAL_SHRINK)) == -1)
1464 return memif_syscall_error_handler (errno);
1466 if ((ftruncate (r->fd, r->region_size)) == -1)
1467 return memif_syscall_error_handler (errno);
1469 if ((r->addr = mmap (NULL, r->region_size, PROT_READ | PROT_WRITE,
1470 MAP_SHARED, r->fd, 0)) == MAP_FAILED)
1471 return memif_syscall_error_handler (errno);
1473 return MEMIF_ERR_SUCCESS;
1477 memif_init_queues (libmemif_main_t * lm, memif_connection_t * conn)
1482 for (i = 0; i < conn->run_args.num_s2m_rings; i++)
1484 ring = memif_get_ring (conn, MEMIF_RING_S2M, i);
1485 DBG ("RING: %p I: %d", ring, i);
1486 ring->head = ring->tail = 0;
1487 ring->cookie = MEMIF_COOKIE;
1489 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1491 uint16_t slot = i * (1 << conn->run_args.log2_ring_size) + j;
1492 ring->desc[j].region = 1;
1493 ring->desc[j].offset =
1494 conn->regions[1].buffer_offset +
1495 (uint32_t) (slot * conn->run_args.buffer_size);
1496 ring->desc[j].length = conn->run_args.buffer_size;
1499 for (i = 0; i < conn->run_args.num_m2s_rings; i++)
1501 ring = memif_get_ring (conn, MEMIF_RING_M2S, i);
1502 DBG ("RING: %p I: %d", ring, i);
1503 ring->head = ring->tail = 0;
1504 ring->cookie = MEMIF_COOKIE;
1506 for (j = 0; j < (1 << conn->run_args.log2_ring_size); j++)
1508 uint16_t slot = (i + conn->run_args.num_s2m_rings) *
1509 (1 << conn->run_args.log2_ring_size) + j;
1510 ring->desc[j].region = 1;
1511 ring->desc[j].offset =
1512 conn->regions[1].buffer_offset +
1513 (uint32_t) (slot * conn->run_args.buffer_size);
1514 ring->desc[j].length = conn->run_args.buffer_size;
1518 DBG ("alloc: %p", lm->alloc);
1519 DBG ("size: %lu", sizeof (memif_queue_t) * conn->run_args.num_s2m_rings);
1521 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1522 conn->run_args.num_s2m_rings);
1524 return MEMIF_ERR_NOMEM;
1528 for (x = 0; x < conn->run_args.num_s2m_rings; x++)
1530 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1531 return memif_syscall_error_handler (errno);
1532 e.key = mq[x].int_fd;
1533 e.data_struct = conn;
1534 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1536 mq[x].ring = memif_get_ring (conn, MEMIF_RING_S2M, x);
1537 DBG ("RING: %p I: %d", mq[x].ring, x);
1538 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1541 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1542 mq[x].last_head = mq[x].last_tail = 0;
1543 mq[x].alloc_bufs = 0;
1545 conn->tx_queues = mq;
1548 (memif_queue_t *) lm->alloc (sizeof (memif_queue_t) *
1549 conn->run_args.num_m2s_rings);
1551 return MEMIF_ERR_NOMEM;
1553 for (x = 0; x < conn->run_args.num_m2s_rings; x++)
1555 if ((mq[x].int_fd = eventfd (0, EFD_NONBLOCK)) < 0)
1556 return memif_syscall_error_handler (errno);
1557 e.key = mq[x].int_fd;
1558 e.data_struct = conn;
1559 add_list_elt (&e, &lm->interrupt_list, &lm->interrupt_list_len);
1561 mq[x].ring = memif_get_ring (conn, MEMIF_RING_M2S, x);
1562 DBG ("RING: %p I: %d", mq[x].ring, x);
1563 mq[x].log2_ring_size = conn->run_args.log2_ring_size;
1566 (void *) mq[x].ring - (void *) conn->regions[mq->region].addr;
1567 mq[x].last_head = mq[x].last_tail = 0;
1568 mq[x].alloc_bufs = 0;
1570 conn->rx_queues = mq;
1572 return MEMIF_ERR_SUCCESS;
1576 memif_init_regions_and_queues (memif_connection_t * conn)
1579 libmemif_main_t *lm = &libmemif_main;
1581 /* region 0. rings */
1582 memif_add_region (lm, conn, /* has_buffers */ 0);
1584 /* region 1. buffers */
1585 if (lm->add_external_region)
1588 (memif_region_t *) lm->realloc (conn->regions,
1589 sizeof (memif_region_t) *
1590 ++conn->regions_num);
1592 return MEMIF_ERR_NOMEM;
1595 conn->regions[1].region_size =
1596 conn->run_args.buffer_size * (1 << conn->run_args.log2_ring_size) *
1597 (conn->run_args.num_s2m_rings + conn->run_args.num_m2s_rings);
1598 conn->regions[1].buffer_offset = 0;
1599 lm->add_external_region (&conn->regions[1].addr,
1600 conn->regions[1].region_size,
1601 &conn->regions[1].fd, conn->private_ctx);
1602 conn->regions[1].is_external = 1;
1606 memif_add_region (lm, conn, 1);
1609 memif_init_queues (lm, conn);
1615 memif_buffer_enq_tx (memif_conn_handle_t conn, uint16_t qid,
1616 memif_buffer_t * bufs, uint16_t count,
1617 uint16_t * count_out)
1619 memif_connection_t *c = (memif_connection_t *) conn;
1620 if (EXPECT_FALSE (c == NULL))
1621 return MEMIF_ERR_NOCONN;
1622 if (EXPECT_FALSE (c->fd < 0))
1623 return MEMIF_ERR_DISCONNECTED;
1625 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1626 run_args.num_s2m_rings;
1627 if (EXPECT_FALSE (qid >= num))
1628 return MEMIF_ERR_QID;
1629 if (EXPECT_FALSE (!count_out))
1630 return MEMIF_ERR_INVAL_ARG;
1631 if (EXPECT_FALSE (c->args.is_master))
1632 return MEMIF_ERR_INVAL_ARG;
1634 memif_queue_t *mq = &c->tx_queues[qid];
1635 memif_ring_t *ring = mq->ring;
1637 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1640 int err = MEMIF_ERR_SUCCESS; /* 0 */
1643 ring_size = (1 << mq->log2_ring_size);
1644 slot = (c->args.is_master) ? ring->tail : ring->head;
1645 slot += mq->alloc_bufs;
1647 /* can only be called by slave */
1648 ns = ring_size - (ring->head + mq->alloc_bufs) + ring->tail;
1654 if (EXPECT_FALSE ((b0->flags & MEMIF_BUFFER_FLAG_RX) == 0))
1656 /* not a valid buffer */
1660 b0->flags &= ~MEMIF_BUFFER_FLAG_RX;
1662 ((memif_ring_t *) b0->ring)->desc[b0->desc_index & mask].offset = ring->desc[slot & mask].offset; /* put free buffer on rx ring */
1664 ring->desc[slot & mask].offset =
1665 (uint32_t) (b0->data -
1666 c->regions[ring->desc[slot & mask].region].addr);
1667 ring->desc[slot & mask].flags |=
1668 (b0->flags & MEMIF_BUFFER_FLAG_NEXT) ? MEMIF_DESC_FLAG_NEXT : 0;
1670 b0->desc_index = slot;
1681 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1686 DBG ("ring buffer full! qid: %u", qid);
1687 err = MEMIF_ERR_NOBUF_RING;
1694 memif_buffer_alloc (memif_conn_handle_t conn, uint16_t qid,
1695 memif_buffer_t * bufs, uint16_t count,
1696 uint16_t * count_out, uint16_t size)
1698 memif_connection_t *c = (memif_connection_t *) conn;
1699 if (EXPECT_FALSE (c == NULL))
1700 return MEMIF_ERR_NOCONN;
1701 if (EXPECT_FALSE (c->fd < 0))
1702 return MEMIF_ERR_DISCONNECTED;
1704 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1705 run_args.num_s2m_rings;
1706 if (EXPECT_FALSE (qid >= num))
1707 return MEMIF_ERR_QID;
1708 if (EXPECT_FALSE (!count_out))
1709 return MEMIF_ERR_INVAL_ARG;
1711 libmemif_main_t *lm = &libmemif_main;
1712 memif_queue_t *mq = &c->tx_queues[qid];
1713 memif_ring_t *ring = mq->ring;
1715 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1716 uint32_t offset_mask = c->run_args.buffer_size - 1;
1719 int err = MEMIF_ERR_SUCCESS; /* 0 */
1720 uint16_t dst_left, src_left;
1721 uint16_t saved_count;
1722 memif_buffer_t *saved_b;
1725 ring_size = (1 << mq->log2_ring_size);
1726 slot = (c->args.is_master) ? ring->tail : ring->head;
1727 slot += mq->alloc_bufs;
1729 if (c->args.is_master)
1730 ns = ring->head - (ring->tail + mq->alloc_bufs);
1732 ns = ring_size - (ring->head + mq->alloc_bufs) + ring->tail;
1736 b0 = (bufs + *count_out);
1739 saved_count = count;
1741 b0->desc_index = slot;
1742 ring->desc[slot & mask].flags = 0;
1744 /* slave can produce buffer with original length */
1745 dst_left = (c->args.is_master) ? ring->desc[slot & mask].length :
1746 c->run_args.buffer_size;
1751 if (EXPECT_FALSE (dst_left == 0))
1760 ring->desc[b0->desc_index & mask].flags |=
1761 MEMIF_DESC_FLAG_NEXT;
1762 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1764 b0 = (bufs + *count_out);
1765 b0->desc_index = slot;
1767 (c->args.is_master) ? ring->desc[slot & mask].
1768 length : c->run_args.buffer_size;
1769 ring->desc[slot & mask].flags = 0;
1773 /* rollback allocated chain buffers */
1774 memset (saved_b, 0, sizeof (memif_buffer_t)
1775 * (saved_count - count + 1));
1776 *count_out -= saved_count - count;
1777 mq->alloc_bufs = saved_count - count;
1781 b0->len = memif_min (dst_left, src_left);
1783 /* slave resets buffer offset */
1784 if (c->args.is_master == 0)
1786 memif_desc_t *d = &ring->desc[slot & mask];
1787 if (lm->get_external_buffer_offset)
1788 d->offset = lm->get_external_buffer_offset (c->private_ctx);
1790 d->offset = d->offset - (d->offset & offset_mask);
1792 b0->data = memif_get_buffer (c, ring, slot & mask);
1794 src_left -= b0->len;
1795 dst_left -= b0->len;
1807 DBG ("allocated: %u/%u bufs. Total %u allocated bufs", *count_out, count,
1812 DBG ("ring buffer full! qid: %u", qid);
1813 err = MEMIF_ERR_NOBUF_RING;
1820 memif_refill_queue (memif_conn_handle_t conn, uint16_t qid, uint16_t count,
1823 memif_connection_t *c = (memif_connection_t *) conn;
1824 if (EXPECT_FALSE (c == NULL))
1825 return MEMIF_ERR_NOCONN;
1826 if (EXPECT_FALSE (c->fd < 0))
1827 return MEMIF_ERR_DISCONNECTED;
1829 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1830 run_args.num_m2s_rings;
1831 if (EXPECT_FALSE (qid >= num))
1832 return MEMIF_ERR_QID;
1833 libmemif_main_t *lm = &libmemif_main;
1834 memif_queue_t *mq = &c->rx_queues[qid];
1835 memif_ring_t *ring = mq->ring;
1836 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1837 uint32_t offset_mask = c->run_args.buffer_size - 1;
1840 if (c->args.is_master)
1842 MEMIF_MEMORY_BARRIER ();
1844 (ring->tail + count <=
1845 mq->last_head) ? ring->tail + count : mq->last_head;
1846 return MEMIF_ERR_SUCCESS;
1849 uint16_t head = ring->head;
1850 uint16_t ns = (1 << mq->log2_ring_size) - head + mq->last_tail;
1851 head += (count < ns) ? count : ns;
1857 d = &ring->desc[slot & mask];
1859 d->length = c->run_args.buffer_size - headroom;
1860 if (lm->get_external_buffer_offset)
1861 d->offset = lm->get_external_buffer_offset (c->private_ctx);
1863 d->offset = d->offset - (d->offset & offset_mask) + headroom;
1867 MEMIF_MEMORY_BARRIER ();
1870 return MEMIF_ERR_SUCCESS; /* 0 */
1874 memif_tx_burst (memif_conn_handle_t conn, uint16_t qid,
1875 memif_buffer_t * bufs, uint16_t count, uint16_t * tx)
1877 memif_connection_t *c = (memif_connection_t *) conn;
1878 if (EXPECT_FALSE (c == NULL))
1879 return MEMIF_ERR_NOCONN;
1880 if (EXPECT_FALSE (c->fd < 0))
1881 return MEMIF_ERR_DISCONNECTED;
1883 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
1884 run_args.num_s2m_rings;
1885 if (EXPECT_FALSE (qid >= num))
1886 return MEMIF_ERR_QID;
1887 if (EXPECT_FALSE (!tx))
1888 return MEMIF_ERR_INVAL_ARG;
1890 memif_queue_t *mq = &c->tx_queues[qid];
1891 memif_ring_t *ring = mq->ring;
1892 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1896 if (count > mq->alloc_bufs)
1897 count = mq->alloc_bufs;
1899 if (EXPECT_FALSE (count == 0))
1900 return MEMIF_ERR_SUCCESS;
1905 ring->desc[b0->desc_index & mask].length = b0->len;
1907 #ifdef MEMIF_DBG_SHM
1908 printf ("offset: %-6d\n", ring->desc[b0->desc_index & mask].offset);
1909 printf ("data: %p\n",
1910 memif_get_buffer (c, ring, b0->desc_index & mask));
1911 printf ("index: %u\n", b0->desc_index);
1912 print_bytes (memif_get_buffer (c, ring, b0->desc_index & mask),
1913 ring->desc[b0->desc_index & mask].length, DBG_TX_BUF);
1914 #endif /* MEMIF_DBG_SHM */
1921 MEMIF_MEMORY_BARRIER ();
1922 if (c->args.is_master)
1923 ring->tail = b0->desc_index + 1;
1925 ring->head = b0->desc_index + 1;
1927 mq->alloc_bufs -= *tx;
1929 if ((ring->flags & MEMIF_RING_FLAG_MASK_INT) == 0)
1932 int r = write (mq->int_fd, &a, sizeof (a));
1934 return MEMIF_ERR_INT_WRITE;
1937 return MEMIF_ERR_SUCCESS; /* 0 */
1941 memif_rx_burst (memif_conn_handle_t conn, uint16_t qid,
1942 memif_buffer_t * bufs, uint16_t count, uint16_t * rx)
1944 memif_connection_t *c = (memif_connection_t *) conn;
1945 if (EXPECT_FALSE (c == NULL))
1946 return MEMIF_ERR_NOCONN;
1947 if (EXPECT_FALSE (c->fd < 0))
1948 return MEMIF_ERR_DISCONNECTED;
1950 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
1951 run_args.num_m2s_rings;
1952 if (EXPECT_FALSE (qid >= num))
1953 return MEMIF_ERR_QID;
1954 if (EXPECT_FALSE (!rx))
1955 return MEMIF_ERR_INVAL_ARG;
1957 memif_queue_t *mq = &c->rx_queues[qid];
1958 memif_ring_t *ring = mq->ring;
1959 uint16_t cur_slot, last_slot;
1961 uint16_t mask = (1 << mq->log2_ring_size) - 1;
1966 ssize_t r = read (mq->int_fd, &b, sizeof (b));
1967 if (EXPECT_FALSE ((r == -1) && (errno != EAGAIN)))
1968 return memif_syscall_error_handler (errno);
1970 cur_slot = (c->args.is_master) ? mq->last_head : mq->last_tail;
1971 last_slot = (c->args.is_master) ? ring->head : ring->tail;
1972 if (cur_slot == last_slot)
1973 return MEMIF_ERR_SUCCESS;
1975 ns = last_slot - cur_slot;
1981 b0->desc_index = cur_slot;
1982 b0->data = memif_get_buffer (c, ring, cur_slot & mask);
1983 b0->len = ring->desc[cur_slot & mask].length;
1984 /* slave resets buffer length */
1985 if (c->args.is_master == 0)
1987 ring->desc[cur_slot & mask].length = c->run_args.buffer_size;
1990 b0->flags = MEMIF_BUFFER_FLAG_RX;
1991 if (ring->desc[cur_slot & mask].flags & MEMIF_DESC_FLAG_NEXT)
1993 b0->flags |= MEMIF_BUFFER_FLAG_NEXT;
1994 ring->desc[cur_slot & mask].flags &= ~MEMIF_DESC_FLAG_NEXT;
1996 /* b0->offset = ring->desc[cur_slot & mask].offset;*/
1998 #ifdef MEMIF_DBG_SHM
1999 printf ("data: %p\n", b0->data);
2000 printf ("index: %u\n", b0->desc_index);
2001 printf ("ring: %p\n", b0->ring);
2002 print_bytes (b0->data, b0->len, DBG_RX_BUF);
2003 #endif /* MEMIF_DBG_SHM */
2011 if (c->args.is_master)
2012 mq->last_head = cur_slot;
2014 mq->last_tail = cur_slot;
2018 DBG ("not enough buffers!");
2019 return MEMIF_ERR_NOBUF;
2022 return MEMIF_ERR_SUCCESS; /* 0 */
2026 memif_get_details (memif_conn_handle_t conn, memif_details_t * md,
2027 char *buf, ssize_t buflen)
2029 libmemif_main_t *lm = &libmemif_main;
2030 memif_connection_t *c = (memif_connection_t *) conn;
2032 return MEMIF_ERR_NOCONN;
2034 int err = MEMIF_ERR_SUCCESS, i;
2038 l1 = strlen ((char *) c->args.interface_name);
2039 if (l0 + l1 < buflen)
2042 (uint8_t *) strcpy (buf + l0, (char *) c->args.interface_name);
2046 err = MEMIF_ERR_NOBUF_DET;
2048 l1 = strlen ((char *) lm->app_name);
2049 if (l0 + l1 < buflen)
2051 md->inst_name = (uint8_t *) strcpy (buf + l0, (char *) lm->app_name);
2055 err = MEMIF_ERR_NOBUF_DET;
2057 l1 = strlen ((char *) c->remote_if_name);
2058 if (l0 + l1 < buflen)
2060 md->remote_if_name =
2061 (uint8_t *) strcpy (buf + l0, (char *) c->remote_if_name);
2065 err = MEMIF_ERR_NOBUF_DET;
2067 l1 = strlen ((char *) c->remote_name);
2068 if (l0 + l1 < buflen)
2070 md->remote_inst_name =
2071 (uint8_t *) strcpy (buf + l0, (char *) c->remote_name);
2075 err = MEMIF_ERR_NOBUF_DET;
2077 md->id = c->args.interface_id;
2079 if (strlen ((char *) c->args.secret) > 0)
2081 l1 = strlen ((char *) c->args.secret);
2082 if (l0 + l1 < buflen)
2084 md->secret = (uint8_t *) strcpy (buf + l0, (char *) c->args.secret);
2088 err = MEMIF_ERR_NOBUF_DET;
2091 md->role = (c->args.is_master) ? 0 : 1;
2092 md->mode = c->args.mode;
2094 l1 = strlen ((char *) c->args.socket_filename);
2095 if (l0 + l1 < buflen)
2097 md->socket_filename =
2098 (uint8_t *) strcpy (buf + l0, (char *) c->args.socket_filename);
2102 err = MEMIF_ERR_NOBUF_DET;
2104 l1 = strlen ((char *) c->remote_disconnect_string);
2105 if (l0 + l1 < buflen)
2108 (uint8_t *) strcpy (buf + l0, (char *) c->remote_disconnect_string);
2112 err = MEMIF_ERR_NOBUF_DET;
2114 md->regions_num = c->regions_num;
2115 l1 = sizeof (memif_region_details_t) * md->regions_num;
2116 if (l0 + l1 <= buflen)
2118 md->regions = (memif_region_details_t *) (buf + l0);
2119 for (i = 0; i < md->regions_num; i++)
2121 md->regions[i].index = i;
2122 md->regions[i].addr = c->regions[i].addr;
2123 md->regions[i].size = c->regions[i].region_size;
2124 md->regions[i].fd = c->regions[i].fd;
2125 md->regions[i].is_external = c->regions[i].is_external;
2130 err = MEMIF_ERR_NOBUF_DET;
2133 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2134 run_args.num_m2s_rings;
2136 l1 = sizeof (memif_queue_details_t) * md->rx_queues_num;
2137 if (l0 + l1 <= buflen)
2139 md->rx_queues = (memif_queue_details_t *) (buf + l0);
2140 for (i = 0; i < md->rx_queues_num; i++)
2142 md->rx_queues[i].region = c->rx_queues[i].region;
2143 md->rx_queues[i].qid = i;
2144 md->rx_queues[i].ring_size = (1 << c->rx_queues[i].log2_ring_size);
2145 md->rx_queues[i].flags = c->rx_queues[i].ring->flags;
2146 md->rx_queues[i].head = c->rx_queues[i].ring->head;
2147 md->rx_queues[i].tail = c->rx_queues[i].ring->tail;
2148 md->rx_queues[i].buffer_size = c->run_args.buffer_size;
2153 err = MEMIF_ERR_NOBUF_DET;
2156 (c->args.is_master) ? c->run_args.num_m2s_rings : c->
2157 run_args.num_s2m_rings;
2159 l1 = sizeof (memif_queue_details_t) * md->tx_queues_num;
2160 if (l0 + l1 <= buflen)
2162 md->tx_queues = (memif_queue_details_t *) (buf + l0);
2163 for (i = 0; i < md->tx_queues_num; i++)
2165 md->tx_queues[i].region = c->tx_queues[i].region;
2166 md->tx_queues[i].qid = i;
2167 md->tx_queues[i].ring_size = (1 << c->tx_queues[i].log2_ring_size);
2168 md->tx_queues[i].flags = c->tx_queues[i].ring->flags;
2169 md->tx_queues[i].head = c->tx_queues[i].ring->head;
2170 md->tx_queues[i].tail = c->tx_queues[i].ring->tail;
2171 md->tx_queues[i].buffer_size = c->run_args.buffer_size;
2176 err = MEMIF_ERR_NOBUF_DET;
2178 md->link_up_down = (c->fd > 0) ? 1 : 0;
2184 memif_get_queue_efd (memif_conn_handle_t conn, uint16_t qid, int *efd)
2186 memif_connection_t *c = (memif_connection_t *) conn;
2189 return MEMIF_ERR_NOCONN;
2191 return MEMIF_ERR_DISCONNECTED;
2193 (c->args.is_master) ? c->run_args.num_s2m_rings : c->
2194 run_args.num_m2s_rings;
2196 return MEMIF_ERR_QID;
2198 *efd = c->rx_queues[qid].int_fd;
2200 return MEMIF_ERR_SUCCESS;
2206 libmemif_main_t *lm = &libmemif_main;
2207 if (lm->control_list)
2208 lm->free (lm->control_list);
2209 lm->control_list = NULL;
2210 if (lm->interrupt_list)
2211 lm->free (lm->interrupt_list);
2212 lm->interrupt_list = NULL;
2213 if (lm->listener_list)
2214 lm->free (lm->listener_list);
2215 lm->listener_list = NULL;
2216 if (lm->pending_list)
2217 lm->free (lm->pending_list);
2218 lm->pending_list = NULL;
2219 if (poll_cancel_fd != -1)
2220 close (poll_cancel_fd);
2222 return MEMIF_ERR_SUCCESS; /* 0 */